/* Trikvetra Software AS – site styles. Pure CSS, no build step. */

/* Cinzel (SIL Open Font License, css/fonts/free/Cinzel-OFL.txt): free for the web.
   Replaces Jupiter Pro, whose web licence is not confirmed. */
@font-face {
  font-family: "Cinzel";
  src: url("fonts/free/Cinzel.ttf") format("truetype");
  font-weight: 400 900;
  font-display: swap;
}

:root {
  /* heritage colours of the old site and the logo */
  --bg: #001a23;
  --bg-deep: #000d14;
  --navy-1: #00143a;   /* top petal   */
  --navy-2: #083365;   /* left petal  */
  --navy-3: #00659f;   /* right petal */
  --link: #4863a0;

  /* accents of the three fields + a fourth for products */
  --gold: #e8b64c;     /* collectors and researchers */
  --ember: #e45a33;    /* Delphi (the old site's hover colour) */
  --teal: #1fc8b4;     /* microcontrollers */
  --sky: #5aa9ec;
  --violet: #a98be8;   /* fifth product */

  --text: #e8eef2;
  --muted: #8fa3b0;
  --serif: "Cinzel", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --halo: 0, 101, 159;  /* rgb of the halo behind the logo, set by JS */
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  background: radial-gradient(ellipse at 50% 30%, #00293a 0%, var(--bg) 45%, var(--bg-deep) 100%) fixed;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

#sky {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* ======================= Aurora (whole page, behind everything) =======================
   Three soft curtains, blurred and masked into vertical rays, sway slowly and cross-fade
   green -> yellow -> red. Fixed like the star sky, so it stays while the page scrolls.
   Kept faint on purpose: it should be noticed, not watched. */

.aurora {
  position: fixed;
  inset: 0 -10%;
  z-index: -1;                 /* after the star canvas in the page, so above it; below all content */
  pointer-events: none;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 12%, #000 70%, transparent 100%);
          mask-image: linear-gradient(to bottom, transparent 0%, #000 12%, #000 70%, transparent 100%);
}

.curtain {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 85%;
  filter: blur(26px);          /* on the parent, so it softens the rays masked into the child */
  mix-blend-mode: screen;
  opacity: 0;
  transform-origin: 50% 0;
  animation:
    aurora-pulse 27s ease-in-out infinite,
    aurora-sway 41s ease-in-out infinite alternate;
}

/* the light itself: a soft band (no hard outline) cut into uneven vertical rays */
.curtain::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 38% 30% at var(--x, 35%) 42%, var(--aur), transparent 72%),
    radial-gradient(ellipse 34% 24% at calc(var(--x, 35%) + 30%) 30%, var(--aur2, var(--aur)), transparent 72%);
  -webkit-mask-image: repeating-linear-gradient(96deg,
      #000 0, rgba(0,0,0,.25) 1.7%, #000 2.9%, rgba(0,0,0,.55) 4.1%, rgba(0,0,0,.15) 5.6%, #000 7.3%);
          mask-image: repeating-linear-gradient(96deg,
      #000 0, rgba(0,0,0,.25) 1.7%, #000 2.9%, rgba(0,0,0,.55) 4.1%, rgba(0,0,0,.15) 5.6%, #000 7.3%);
}

.c-green  { --aur: rgba(80, 230, 150, .50); --x: 30%; animation-delay: -7s, 0s;   /* already glowing when the page opens */ }
.c-yellow { --aur: rgba(225, 220, 110, .40); --x: 22%; animation-delay: -16s, -14s; top: -4%; }
.c-red    { --aur: rgba(240, 60, 110, .80); --aur2: rgba(175, 80, 235, .75); /* red + purple */ --x: 40%; animation-delay: -25s, -27s; top: 6%;
            animation-name: aurora-pulse-red, aurora-sway; /* red reads darker on the blue sky, so it rises higher */ }

/* each curtain is up for a third of the cycle, overlapping its neighbours */
@keyframes aurora-pulse {
  0%, 100% { opacity: 0; }
  15%      { opacity: .26; }
  33%      { opacity: .32; }
  50%      { opacity: .10; }
  62%      { opacity: 0; }
}

@keyframes aurora-pulse-red {
  0%, 100% { opacity: 0; }
  15%      { opacity: .45; }
  33%      { opacity: .55; }
  50%      { opacity: .18; }
  62%      { opacity: 0; }
}

@keyframes aurora-sway {
  0%   { transform: translateX(-4%) skewX(-8deg) scaleY(.92); }
  50%  { transform: translateX(2%)  skewX(4deg)  scaleY(1.05); }
  100% { transform: translateX(5%)  skewX(-3deg) scaleY(.97); }
}

/* ======================= Hero ======================= */

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto auto;
  grid-template-areas:
    ".    top   .    "
    "left logo  right"
    ".    word  .    ";
  align-content: center;
  justify-items: center;
  column-gap: 0;
  padding: 4rem 1.5rem 5rem;
  position: relative;
}

.logo-wrap {
  grid-area: logo;
  position: relative;
  width: clamp(220px, 44vmin, 420px);
  aspect-ratio: 1;
  margin: .4rem 0 -2.5rem;           /* the knot sits high in its square box */
  cursor: pointer;
  outline: none;
}

.logo {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: visible;
  filter: drop-shadow(0 0 0 rgba(var(--halo), 0));
  transition: filter .8s ease, transform .8s cubic-bezier(.2, .8, .2, 1);
}

.spinner {
  transform-origin: 253px 224px;          /* centre of the knot in view-box units */
  transition: transform 1.6s cubic-bezier(.2, .8, .2, 1);
}

.petal {
  transition: fill .7s ease, opacity .7s ease;
}
.petal-top   { fill: var(--navy-1); }
.petal-left  { fill: var(--navy-2); }
.petal-right { fill: var(--navy-3); }

.sheen {
  opacity: .25;
  mix-blend-mode: screen;
  pointer-events: none;
  transition: opacity .7s ease;
}

.halo {
  position: absolute;
  inset: -30%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--halo), .35) 0%, rgba(var(--halo), .12) 35%, transparent 65%);
  opacity: .45;
  transform: scale(.85);
  transition: opacity 1s ease, transform 1s ease, background 1s ease;
  pointer-events: none;
}

/* -- logo hover: the three colours run around the knot, and the knot turns one third -- */
.logo-wrap:hover .spinner,
.logo-wrap:focus-visible .spinner,
.logo-wrap.is-active .spinner { transform: rotate(120deg); }

.logo-wrap:hover .logo,
.logo-wrap:focus-visible .logo,
.logo-wrap.is-active .logo {
  filter: drop-shadow(0 0 22px rgba(var(--halo), .55));
  transform: scale(1.06);
}

.logo-wrap:hover .halo,
.logo-wrap:focus-visible .halo,
.logo-wrap.is-active .halo {
  opacity: 1;
  transform: scale(1.05);
  animation: breathe 3s ease-in-out infinite;
}

.logo-wrap:hover .sheen,
.logo-wrap:focus-visible .sheen,
.logo-wrap.is-active .sheen { opacity: .45; }

.logo-wrap:hover .petal,
.logo-wrap:focus-visible .petal,
.logo-wrap.is-active .petal { animation: cycle 3.6s linear infinite; }

.logo-wrap:hover .petal-left,
.logo-wrap:focus-visible .petal-left,
.logo-wrap.is-active .petal-left { animation-delay: -1.2s; }

.logo-wrap:hover .petal-right,
.logo-wrap:focus-visible .petal-right,
.logo-wrap.is-active .petal-right { animation-delay: -2.4s; }

@keyframes cycle {
  0%    { fill: var(--gold); }
  33.3% { fill: var(--ember); }
  66.6% { fill: var(--teal); }
  100%  { fill: var(--gold); }
}

@keyframes breathe {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.12); }
}

/* -- one field in focus (hover on its label or card): its petal lights up -- */
body[data-focus] .petal { opacity: .45; }
body[data-focus="top"]   .petal-top   { fill: var(--gold);  opacity: 1; }
body[data-focus="left"]  .petal-left  { fill: var(--ember); opacity: 1; }
body[data-focus="right"] .petal-right { fill: var(--teal);  opacity: 1; }
body[data-focus] .halo { opacity: .9; }

/* ---- the three field labels around the logo ---- */
.field {
  --accent: var(--gold);
  position: relative;
  display: inline-block;
  padding: .6rem .2rem;
  text-align: center;
  font-size: clamp(.78rem, 1.3vw, .95rem);
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: #fff;
  transition: color .5s ease, text-shadow .5s ease, transform .5s ease;
}
.field-top   { grid-area: top; }
.field-left  { grid-area: left;  justify-self: end;   align-self: end; text-align: right; margin: 0 -1.5rem 3.2rem 0; }
.field-right { grid-area: right; justify-self: start; align-self: end; text-align: left;  margin: 0 0 3.2rem -1.5rem; }

.field::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  transition: width .6s ease, left .6s ease;
}
.field:hover, .field:focus-visible {
  color: var(--accent);
  text-shadow: 0 0 18px var(--accent);
  outline: none;
}
.field:hover::after, .field:focus-visible::after { width: 100%; left: 0; }
.field-left:hover  { transform: translateX(-4px); }
.field-right:hover { transform: translateX(4px); }
.field-top:hover   { transform: translateY(-4px); }

/* ---- word mark ---- */
.wordmark {
  grid-area: word;
  text-align: center;
  margin-top: 1.4rem;
}
.wordmark h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 3.6rem);
  letter-spacing: .28em;
  margin-right: -.28em;               /* letter-spacing leaves a gap on the right */
  background: linear-gradient(100deg, #fff 0%, #fff 40%, var(--gold) 50%, #fff 60%, #fff 100%);
  background-size: 300% 100%;
  background-position: 100% 0;
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  animation: shine 9s ease-in-out infinite;
}
.wordmark .sub {
  margin: .2rem 0 0;
  font-size: .8rem;
  letter-spacing: .6em;
  margin-right: -.6em;
  color: var(--muted);
}

.wordmark .place {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .55em;
  margin: .9rem 0 0;
  font-size: .68rem;
  letter-spacing: .35em;
  margin-right: -.35em;
  color: var(--muted);
}
.wordmark .flag {
  width: 1.65em;
  height: 1.2em;
  border-radius: 1px;
  opacity: .9;
}

@keyframes shine {
  0%, 60% { background-position: 100% 0; }
  100%    { background-position: 0% 0; }
}

.scroll-hint {
  position: absolute;
  bottom: 1.6rem;
  left: 50%;
  translate: -50% 0;
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255, 255, 255, .35);
  border-radius: 14px;
  transition: border-color .4s;
}
.scroll-hint span {
  position: absolute;
  left: 50%;
  top: 8px;
  width: 4px;
  height: 8px;
  margin-left: -2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, .7);
  animation: wheel 2s ease-in-out infinite;
}
.scroll-hint:hover { border-color: var(--gold); }
@keyframes wheel {
  0%   { transform: translateY(0);    opacity: 1; }
  80%  { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0);    opacity: 0; }
}

/* ======================= Portfolio ======================= */

.portfolio {
  max-width: 1180px;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

.lead {
  max-width: 760px;
  margin: 0 auto 3.5rem;
  text-align: center;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: #c9d6de;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.6rem;
}

.card {
  --accent: var(--gold);
  position: relative;
  padding: 2rem 1.8rem 1.6rem;
  border-radius: 18px;
  background: linear-gradient(160deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .015));
  border: 1px solid rgba(255, 255, 255, .08);
  backdrop-filter: blur(6px);
  overflow: hidden;
  transition: transform .5s cubic-bezier(.2, .8, .2, 1), border-color .5s, box-shadow .5s;
  scroll-margin-top: 2rem;
}
.card::before {                       /* accent line on top that grows on hover */
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  height: 3px;
  width: 30%;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: width .6s ease;
}
.card::after {                        /* soft light that follows the mouse (set by JS) */
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(380px circle at var(--mx, 50%) var(--my, 0%),
              color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%);
  opacity: 0;
  transition: opacity .5s;
  pointer-events: none;
}
.card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: 0 18px 50px -20px color-mix(in srgb, var(--accent) 55%, transparent);
}
.card:hover::before { width: 100%; }
.card:hover::after  { opacity: 1; }

.card-icon {
  width: 52px;
  height: 52px;
  color: var(--accent);
  margin-bottom: 1rem;
  transition: transform .6s cubic-bezier(.2, .8, .2, 1);
}
.card:hover .card-icon { transform: scale(1.12) rotate(-4deg); }
.card-icon svg { width: 100%; height: 100%; }

.card h2 {
  margin: 0 0 .7rem;
  font-size: 1.22rem;
  line-height: 1.3;
  font-weight: 650;
  color: #fff;
}
.card p { margin: 0 0 1rem; color: #b8c7d0; font-size: .97rem; }
.card ul { margin: 0; padding: 0; list-style: none; }
.card li {
  position: relative;
  padding-left: 1.2rem;
  margin: .3rem 0;
  font-size: .92rem;
  color: #dbe5eb;
}
.card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

/* reveal on scroll */
.js .reveal { opacity: 0; transform: translateY(28px); }
.reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .9s ease, transform .9s cubic-bezier(.2, .8, .2, 1);
}
.reveal.is-visible:hover { transform: translateY(-6px); }
.cards .reveal:nth-child(2).is-visible { transition-delay: .12s; }
.cards .reveal:nth-child(3).is-visible { transition-delay: .24s; }

/* ======================= Products under the line ======================= */

.products {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.rule {
  height: 1px;
  margin: 0 auto 2.4rem;
  width: min(100%, 980px);
  background: linear-gradient(90deg, transparent, var(--gold), var(--ember), var(--teal), var(--sky), transparent);
  background-size: 200% 100%;
  animation: flow 8s linear infinite;
  opacity: .8;
}
@keyframes flow {
  from { background-position: 0% 0; }
  to   { background-position: 200% 0; }
}

.product-links {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.product-links a {
  --accent: var(--gold);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem .5rem;
  border-radius: 12px;
  text-align: center;
  transition: background .5s, transform .5s cubic-bezier(.2, .8, .2, 1);
}
.pname {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1rem, 1.9vw, 1.35rem);
  letter-spacing: .08em;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--link) 0%, var(--link) 33%, var(--accent) 50%, #fff 60%, var(--link) 75%, var(--link) 100%);
  background-size: 300% 100%;
  background-position: 0% 0;
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  transition: background-position 1.2s ease;
}
.pdesc {
  margin-top: .25rem;
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--muted);
  transition: color .5s;
}
.product-links a:hover,
.product-links a:focus-visible {
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  transform: translateY(-3px);
  outline: none;
}
.product-links a:hover .pname,
.product-links a:focus-visible .pname { background-position: 100% 0; }
.product-links a:hover .pdesc { color: var(--accent); }

/* ======================= Footer ======================= */

footer {
  padding: 1.5rem 1rem 2rem;
  text-align: center;
  font-size: .82rem;
  color: var(--muted);
  letter-spacing: .05em;
}
footer p { margin: 0; }

/* ======================= Product pages ======================= */

.page {
  max-width: 820px;
  margin: 0 auto;
  padding: 3rem 1.5rem 2rem;
  min-height: calc(100vh - 5rem);
}
.back {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  color: var(--muted);
  font-size: .85rem;
  letter-spacing: .15em;
  text-transform: uppercase;
  transition: color .4s;
}
.back img { width: 34px; height: 34px; transition: transform 1s cubic-bezier(.2, .8, .2, 1); }
.back:hover { color: #fff; }
.back:hover img { transform: rotate(120deg); }

.page-head { text-align: center; margin: 4rem 0 2.5rem; }
.page-head h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.4rem);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent, var(--gold));
  text-shadow: 0 0 30px color-mix(in srgb, var(--accent, var(--gold)) 35%, transparent);
}
.page-head p { margin: .6rem 0 0; color: var(--muted); letter-spacing: .1em; }

.page-body { font-size: 1.05rem; color: #c9d6de; }
.page-body .soon {
  margin-top: 2.5rem;
  padding: 1.2rem 1.4rem;
  border-left: 3px solid var(--accent, var(--gold));
  background: rgba(255, 255, 255, .04);
  border-radius: 0 10px 10px 0;
  color: var(--muted);
}

/* ======================= Small screens ======================= */

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "top  top  "
      "logo logo "
      "left right"
      "word word ";
    row-gap: .5rem;
  }
  .field-left, .field-right { justify-self: center; align-self: start; text-align: center; margin: 0; }
  .logo-wrap { margin-bottom: -1rem; }
  .product-links { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition-duration: .01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .c-green { opacity: .22; }             /* a still, faint green glow instead of the pulse */
}